Issues baking normals and ambient occlusion
as far as i can understand you have only one uv at the moment that gives you the colors on the mesh, you will have to create a second one, unwrap it (you can try and assist https://www.youtube.com/watch?v=scPSP_U858k), and bake your ao onto the second uv. 

using two uv's can be a bit confusing (Multiple UV mapping in 2.8 eevee?)

good luck